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Elasticity of superhydrous B

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Abstract

The adiabatic single-crystal elastic moduli of superhydrous B, Mg10Si3O14(OH)4, have been measured at ambient conditions using Brillouin spectroscopy. This material is the first hydrous phase found to be stable at the extreme conditions of 20 GPa and 1400 °C. The single-crystal moduli, in GPa, are: C 11=280.0±1.5, C 22=307.4±1.6, C 33=293.4±1.4, C 44=90.0±1.1, C 55=99.2±0.8, C 66=89.6±0.6, C 12=66.1±2.2, C 13=105.6±2.6, C 23=81.8±2.6. With aggregate elastic properties of K VRH =154.0±4.2 and μ VRH =97.0±0.7 GPa, superhydrous B is approximately 16% suffer than forsterite and 20% softer than magnesium silicate spinel; it is also considerably more elastically isotropic than forsterite. The single-crystal moduli are compared to those of forsterite, magnesium silicate spinel and periclase, materials that are both structurally and compositionally similar to superhydrous B. The longitudinal moduli of superhydrous B and forsterite follow similar trends and appear to be dominated by the incompressibility and rotation of silicon tetrahedra. The shear and off-diagonal moduli more closely resemble those of periclase and spinel and may reflect the properties inherent to layers of magnesium octahedra.

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  1. Rosemary E. Gerald Pacalo

    Present address: Department of Chemistry and Biochemistry, Arizona State University, 85287-1604, Tempe, AZ, USA

Authors and Affiliations

  1. Department of Earth and Space Sciences, State University of New York, 11794-2100, Stony Brook, NY, USA

    Rosemary E. Gerald Pacalo & Donald J. Weidner

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  1. Rosemary E. Gerald Pacalo
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  2. Donald J. Weidner
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Pacalo, R.E.G., Weidner, D.J. Elasticity of superhydrous B. Phys Chem Minerals 23, 520–525 (1996). https://doi.org/10.1007/BF00242001

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